2.The Methods

A terrestrial TV broadcasting frequency band that fits for mobile communications, OFDM (Orthogonal Frequency Division Multiplexing) that withstands interference caused by multiple paths (delayed waves), a modulation method that fits for communications with cell phones and mobile receivers, powerful error correction function, etc. have been adopted to allow good communications with cell phones and mobile receivers.

・Concerning information compression technology and multiplexing technology, MPEG-2 has been adopted after diverse compatible communications with digital broadcastings (such as terrestrial digital TV broadcasting, BS digital broadcasting, CS digital broadcasting) were considered. MPEG-2 offers a common base for signal processing, which leads to reduction in the production cost of receivers by using LSI-chip and consolidation of receivers as well as easy exchange of data with other media.

・Since this broadcasting system has the common segment structure with terrestrial digital TV broadcasting, the receivers can be consolidated.